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The Commemorative
Quarter for
South Dakota
The Commemorative Quarter for South Dakota

Time Zone: Clay County lies in the Central Time Zone (CST/CDT) and observes daylight saving time.

The community of Vermillion is the Seat for Clay County.

Clay County was founded in 1862.

From the Census Estimates for 2009, <1> Clay had a population of 13,490 people. This is a decrease of 0.35% since the last Census (which gave a population of 13,537 people in 2000).

At the time of the 2000 Census, Clay represented 1.79% of the total population of South Dakota, making it the state's 13th most populous county (out of 66 counties).

The following table shows the recent changes in population. Other than 2000, the population counts have been estimated by the Census Bureau.

Since 2000
Year-to-Year Change
201013,864+2.42%+2.77% since 2009
200913,490-0.35%-0.79% since 2008
200813,597+0.44%+1.03% since 2007
200013,537The Last Census

More information can be found on the Clay County Census Page for Clay County.


Websites for Clay County

Official Website:   www.claycountysd.org/

If you know of a history or genealogy society whose interest includes Clay County, would you please send us the URL for their website? We would like to add their link to our Gazetteer. To contact us, please visit our Feedback Page.

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Footnotes ...

<1>On a yearly basis, the US Census Bureau creates an estimate of the county's population. Keep in mind that this is an estimate and not an actual count. The last physical count was the 2000 Census and the next count will be for the 2010 Census.

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<2>All Quarter-dollar coin images from the United States Mint.

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